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Anyone currently digging into modern loader protection?
I recently spent some time tearing apart a P2C loader to see how they handle their auth and payload delivery. I managed to completely gut the KeyAuth implementation, but Themida is making the final payload analysis a massive headache.
The Progress So Far:
The Themida Roadblock
Even with a decrypted dump, the logic is caked in Themida's virtualization layer. The developers were smart enough to wrap all the critical game logic and offset retrievals inside VM macros. Static analysis is basically a dead end right now because every xref leads directly into massive obfuscated blocks and virtualized VM dispatchers.
Since the logic executes strictly through these handlers, the dumped image is practically useless without a proper lifter. I'm looking for someone who has real experience writing devirtualizers for modern Themida or who can point towards a solid trace-based dynamic approach for this specific protector.
If anyone is down to take a look at the dumped image or help me tackle the VM syntax, drop a message. Anyone handled a similar devirt project recently?
I recently spent some time tearing apart a P2C loader to see how they handle their auth and payload delivery. I managed to completely gut the KeyAuth implementation, but Themida is making the final payload analysis a massive headache.
The Progress So Far:
- KeyAuth Bypass — Stripped the auth by hooking WinHTTP and getaddrinfo. Routed the stream to localhost and spoofed the handshake using the App Secret and OwnerID pulled directly from memory. Emulation is rock solid.
- Payload Capture — The loader decrypts and maps the cheat module after auth. I suspended the process post-decryption and grabbed a raw dump of the unmapped PE from memory around the OEP.
- IAT Reconstruction — Partially fixed the Import Address Table, but it's still a bit messy.
The Themida Roadblock
Even with a decrypted dump, the logic is caked in Themida's virtualization layer. The developers were smart enough to wrap all the critical game logic and offset retrievals inside VM macros. Static analysis is basically a dead end right now because every xref leads directly into massive obfuscated blocks and virtualized VM dispatchers.
Since the logic executes strictly through these handlers, the dumped image is practically useless without a proper lifter. I'm looking for someone who has real experience writing devirtualizers for modern Themida or who can point towards a solid trace-based dynamic approach for this specific protector.
- Auth: KeyAuth (Local Redirection)
- Protection: Themida (Virtualization + Obfuscation)
- Method: Local stream redirection + Handshake spoofing
- Current Status: Logic unreachable due to VM dispatchers
- Protection: Themida (Virtualization + Obfuscation)
- Method: Local stream redirection + Handshake spoofing
- Current Status: Logic unreachable due to VM dispatchers
If anyone is down to take a look at the dumped image or help me tackle the VM syntax, drop a message. Anyone handled a similar devirt project recently?
